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Note Employee benefits (Change in accumulated other comprehensive income loss) (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Pension Plans |  |
Defined Benefit Plan Disclosure |  |
Accumulated other comprehensive loss at beginning of year | $ 290,327 | $ 311,166
Recognized During Year: |  |
Prior service (cost) credit | 0 | 0
Actuarial losses | (20,260) | (21,859)
Ocurring during the year: |  |
Net acturial (gains) losses | 34,263 | 1,020
Total (decrease) increase in AOCL | 14,003 | (20,839)
Accumulated other comprehensive loss at end of year | 304,330 | 290,327
OPEB Plan |  |
Defined Benefit Plan Disclosure |  |
Accumulated other comprehensive loss at beginning of year | 24,079 | 13,865
Recognized During Year: |  |
Prior service (cost) credit | 3,470 | 3,800
Actuarial losses | (1,282) | (569)
Ocurring during the year: |  |
Net acturial (gains) losses | (20,547) | 6,983
Total (decrease) increase in AOCL | (18,359) | 10,214
Accumulated other comprehensive loss at end of year | $ 5,720 | $ 24,079

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